Coding machine



R. HELL CODING MACHINE July 3, 1956 Filed May 6, 1952 5 Sheets-Sheet l July 3, 1956 4 R. HELL I 2,753,034

I CODING MACHINE Filed May e, 1952 s sheets-sheet 2 /ZZI ZJ 24 2 ....@nl' @El 22% l @43 Ei: M 45 g an R. HELL CODING MACHINE July 3, 1956 5 Sheets-Sheet 3 Filed May 6, 1952 2,753,034 ConING MACHINE Rudolf Hell, Kiel-Dietrichsdorf, Germany Application May 6, 1952, Serial No. 236,406 Claims priority, application Germany May 7, 1951 19 Claims. (Cl. 197-4) This invention is concerned with a coding machine of the type in which electrical circuits assigned to individual symbols are interchanged, arbitrary symbols being assigned to the interchanged circuits and such arbitrary symbols being typed or otherwise signalled or characterized.

Circuits are in known machines of this type closed by depressing a symbol key. These circuits extend over one or more permutation drums or disks and effect signal lamps. The individual drums have as many contacts as there are symbols, and the conductors between the current input and output contacts are within the drums interchanged, as desired. In one of the known structures the rst drum is, responsive to each key operation, always advanced by one step, and such drum, after completing each revolution, sets in motion the next successive drum. The motion of the individual drum is released directly responsive to the operation of a key. Coding machines of this type permit only very limited keying speed, because they require application of relatively great keying force which must overcome the frictional factors occurring in the operation of the drums.

The present invention provides for a coding speed of seven releases per second, that is, greater than ever obtained before, and thus permits direct connection of the coding machine with commercial teleprinters.

The machine according to the invention comprises a desired number, for example, tive, permutation disks of generally known construction which are all disposed on a common shaft. The individual permutation disks carry in known manner, circularly disposed on both sides, the contacts associated with the keying mechanism. Between each two permutation disks is arranged a wiper disk provided on both sides with resilient contact wipers which are associated with the individual contacts or" the corresponding permutation disks. In accordance with the invention, the permutation disks are freely rotatable on the common shaft, and the wiper disks are keyed for rotation therewith. The shaft is driven by a motor over a clutch which is operative to cause rotation thereof responsive to operation of a key. The wipers on the wiper disks, which rotate with the shaft, are in frictional engagement with the contacts on the permutation disks, and the latter are thus carried along by friction and rotate with the wiper disks. Each permutation disk is associated with a magnet individual thereto, and such magnet is adapted to be selectively operated so as to attract an armature which engages a ratchet on the associated permutation disk to stop it. These magnets are the holding magnets of the structure. The high operating speed is secured by the motor drive for the entire mechanism. The frictional brushing action, which takes place between the wipers of the wiper disks and the contacts on the permutation disks, keeps these contacts clean and provides for faultless operation thereof.

In accordance with another object and feature, the setting of the individual permutation disks, which is during each switching period controlled by the actuation of nite States Patent 2,753,034 Patented July 3, 1956 2 the holding magnets, is obtained by individual keys so that such setting is primarily dependent on the written text. The available keys may, for example, be subdivided into tive groups, and individual keys may be assigned to the different groups as desired. Each of these fivegroups may Vaffect the holding magnet of a permutation disk so that one or the other such disk is set, depending on the actuation of a key in one or the other group.

A further object provides for an interchanging or permutation mechanism between the key conductors and the holding magnets of the permutation disks, which effects a desired interchange of the individual key groups relative to their associated holding magnets.

Still another object and feature provides for the setting of the individual permutation disks by a punched fivetigure tape which is fed into the machine. Each row of perforations on the tape may be assigned to a holding magnet of the permutation disks, and such assignment can again be interchanged by an auxiliary permutation element. It is in this manner possible, for example, to carry out a stepping cycle controlled by the perforations on the tape and to prevent operation of the holding magnets for nonperforated intervals thereof. Another possibility for effecting the operation of the holding magnets by means of a perforated tape is to successively rotate, for example, the tirst, second, third, etc. permutation disks, and causing each to rotate always by a number of steps in accordance with the number of perforations disposed in the corresponding perforation row. An additional permutation may again be effected with regard to the association of the perforation rows with the permutation disks.

It is further possible to introduce, in addition to the controlled stepping of the permutation disks an auxiliary mutual interaction therebetween, for example, by disposing on each permutation disk peripherally thereof a sequence of contacts for controlling the operation of the successive or any desired disk at such times when a certain contact is actuated by an associated cam.

It is necessary for carrying out the coding to provide for a predetermined starting or normal position of the individual permutation disks. This is accomplished by assigning to the holding magnets manually actuated keys which effect, responsive to depression thereof and while the main shaft is being rotated, a successive switching of the magnets always by one or more steps, until the permutation disks reach the desired position which is indicated by a mark visible through a window disposedover the disks.

The recording of the text which is fed to the machine and of the code text takes place by a special printer mechanism, The latter comprises a rotatable contactor for the conductor group which enters the permutation disks and a similar contactor for the conductor group leaving the disks. On the shaft of these contactors are disposed two type wheels, each conductor or line contact being associated with a symbol or letter thereon. Underneath each type wheel is disposed a printer magnet which is actuated at moments when the conductors in the group carry current connected thereto over the keying mechanism. Accordingly, one of the type wheels will cause printing of that letter or symbol which corresponds to the keyed symbol, while the other type wheel will cause printing of the corresponding coded letter or symbol.

`The new machine may thus be used for coding, and by a simple switching operation it may likewise be used for decoding.

The invention will now be described more in detail with reference to the accompanying diagrammatic drawings showing an example of the new coding machine. In these drawings,

Fig. 1 shows the keying mechanism and various control means;

Fig. 2 shows on top thereof the permutation mechanism and therebelow the printer or recording mechanism and on the right of the latter the drive means;

Fig. 3 illus-trates details with respect to a permutation disk; and

Fig. 4 shows modifications to be made when the machine isto be used for perforating a tape.

Fig. 2 should be arranged at the right of Fig. l with corresponding conductors in alignment'.

The keying mechanism comprises a number of keys, three of which are shown and indicated by numerals 5, 6 and 7. These keys are connected with a` common bearing rail 11, and each key carries an angular lever, as indicated at 8, 9 and 10. Actuation of these keys operates respectively associated contacts such as 12, 13, 14. A suitably journalled locking rail 15 is provided which keeps the actuated individual keys closed for the duration of a coding cycle. The locking ofthe keys is by suitable means effected. responsive to actuation of the bar 16 which is operated by the levers 8, 9 and 10. The bar 16 closes a contact 17 which controls the drive mechanism indicated in Fig. 2. There are usually 26 contacts such as contacts 12, 13, 14, corresponding to the 26 keys of the machine, and these contacts connect a common negative terminal to respectively associated 26 inlets of the permutation mechanism indicated in Fig. 2. The permutation mechanism shown on top of Fig. 2 has a shaft Z0 and freely rotatable on this shaft are five permutation disks 21-25 of generally known structure. Between these disks are disposed four wiper disks indicated at 26-29 which are keyed to the shaft and rotatable therewith. A wiper disk 31 is provided which serves for the current input, and another wiper disk` 32 which serves for the current output.. Each of the wiper disks 26-29 has on each side, uniformly distributed thereon, twenty-six wipers. Identically placed wipers are interconnected. Each of the permutation disks 21-25 carries on each side twenty-six contacts. The contacts on the input side of each permutation disk are, as desired, interconnected with contacts on the output side thereof. Accordingly, the input currents are interchanged. The permutation disks 21-25 being freely rotatable on the shaft, are rotated merely by the frictional pressure of the wipers on the wiper disks, unless one or the other of such permutation disks is held against rotation by its associated holding magnet indicated at 47-51. The disks are removable from the shaft, and. it

is therefore easily possible to exchange them individually for disks providing for different permutation.

Fig. 3 shows one of the permutation disks, for example,- the disk 21. The holding magnet 47 associated with this disk has an armature 41 which can, responsive to energization of the magnet, engage one of the locking teeth 46 disposed peripherally of the disk 21. So long as the associated holding magnet is deenergized, the disk is free to rotate with the adjacent wiper disk. The holding magnets 47-51 thus control the number of steps to be executed by their associated permutation disks. The selective operation of these holding magnets may be accomplished in several ways.

There are, rst, contacts 52-56 which may be closed by cams carried by the respective permutation disks 21-25, to cause operation of a succeeding disk by a preceding one. This particular control is schematically indicated in the drawing by a conductor extending from the contact 52 to a special or auxiliary permutation disk 57. A similar conductor extends to the disk 57 from each of the remaining contacts 53-56. An interchange of the tive conductors can thereby be effected. The auxiliary permutation disk 57 may be a disk of generally known construction, similar to the disks 21-25, having annularly disposed contacts n each side and coacting wiper disks for scanning these contacts, and may be disposed on the shaft 20 or on a shaft geared to it and driven thereby. Another suitable and desired permutation element may be substituted for the disk 57.

The holding magnets 47-51 may also be selectively actuated by theluse of live selection rods 61-65 which are operable by keys such as keys 5 7 in similar manner as in a teleprinter. These selection rods are adapted to actuate respectively associated contacts indicated at 66-70 for closing circuits to the permutation disk 57. By this particular arrangement isobtained a selective alteration of the permutation disks 21-25 dependent on the symbol that may at any time be scanned.

An entirely different control is obtained by the use of a perforated tape such as is schematically indicated at 71. There is provided a scanning mechanism of known structure, as used, for example, in a teleprinter, comprising tive selection rods 201-205 corresponding, so far as their function is concerned, to the selection rods 61-65. The perforated tape 71 is employed in such scanning mechanism to govern the selective operation of these selection rods. Each of these tive selection rods is by this mode of operation governed by one of the ve rows of perforations on the tape 71 which is associated therewith. The auxaliary permutation disk 57 is in such ease used for interchanging the assignment, that is, the association of these perforation rows with respect to the selection rods.

The auxiliary permutation disk 57 may thus be affected by three distinct and separate contact groups, namely, first, by the contacts 52`56 which are cam-controlled by the permutation disks 21-25; second, by the contacts controlled by the key-operated selection rods 61-65; and, third, by contacts controlled by the selection rods 201- 205 which are governed by the perforated tape 71. The corresponding controls may be effected simultaneously or successively or selectively, with some of these occuring simultaneously, depending on the construction of the permutation disk 57 and the number of contacts provided thereon.

The printer mechanism, shown at the bottom of Fig. 2. comprises a shaft 19. There are provided two stationary contact disks 72 and 73. The individual contacts of the disk 72 are interconnected with the current conductors or leads to the keys and to the wiper disk 31, respectively; and the individual contacts of the stationary disk 73 are similarly interconnected with the conductors of the wiper disk 32. Upon the shaft 19' are disposed two rotatable disks 74 and 75 carrying wipers which, during the rotation of the shaft, scan all the contacts of the associated disks 72 and 73. Also disposed upon the shaft 19 are two type wheels 76 and 77. Underneath these type wheels are mova-bly disposed associated recording tapes indicated at 78 and 79 and armatures 80 and 81 respectively associated withy the printer magnets 82 and 83.

The magnet S2 is energized, incident to cach revolution of the shaft 19, at the instant when a contact of the disk 72, which happens to be electrically associated with a depressed key is scanned by the wiper carried by disk 74. The individual types or symbols are suitably arranged on the type wheel 76, and the symbol corresponding to the depressed key will therefore be printed on. the tape 78. The text which is thus being printed upon the tape 78 will be the actual or true text of the message. The analogously constructed and arranged printer mechanism comprising the type wheel 77, the armature 81 and the magnet 83 will print on the associatedl tape 79 the coded text, since the current leads or conductors have been interchanged by the five permutation disks 2li-25. An additional permutation of the individual symbols may be obtained in simple manner by exchange of the type wheel 77 for a similar type wheel on which the symbols appear in different sequence.

The drive mechanism shown at the bottom right of Fig; 2 comprises the motor 91 which drives the shaft 19 over the clutch 93. This clutch is normally disengaged oisans@ by the action of a spring 94 and is actuated responsive to l energization of a magnetl v95 which is energized over a circuit including the contact 17 in the key mechanism shown in Fig. 1 responsive to actuation of one of the selection rods. The clutch magnet 95 is after initial energization, connected in a holding circuit over a contact 96 which is operated by a cam 97 on the shaft 19, so as to always secure'one full revolution of theshaft. Shortly before the shaft 19 completes each full revolution the shaft 20 is interlocked with the shaft 19 and rotated by an angular increment corresponding to one or more l/26; that is, the shaft 2l) is at such times rotated by an amount which corresponds to the stepping of the permutation disks by one or more contact steps.

The machine may be used for decoding by exchanging the input and output conductors or, rather, their associated terminals. It is clear of course that, it' the stepping `of the permutation disks 21-25 is made dependent on the actuation of keys such as the keys 5-7 and therewith on the selectionrods 61-65, a corresponding stepping must be employed incident to the decoding. Five contact cams i-105 are for this purpose disposed on the shaft 19 for controlling associated contacts lilo-110. T hose contacts in turn aifect the holding magnets 47-51 over the auxiliary permutation disk 57. The switching impulse occurs in this case prior to the instants when the holding magnets 47-51 should operate, and it is therefore necessary to provide the holding magnets with suitable delay means which may be known and suitable mechanical or electrical means, including holding contacts.

The operation is as follows: v

When a key such as 5, 6, 7 etc., is depressed, the bar 16 will be operated to close contact 17. This will energize the magnet 95 which will attract its armature 26N) to actuate the clutch 93 so as to couple the shaft 19 with the continuously rotating gear 92 operated by motor 91. Upon start of rotation of the shaft 19, contact 9o will be closed by cam 97 to close a holding circuit for the magnet 95 so that this magnet remains operated (for afull revolution) even if contact 17 should be opened due to release of the keys 5, 6, 7' etc. At the end of the rotation through one revolution, cam 97 will open contact 96 and the shaft 19 will stop. Magnets A, 211 and C are energized for the duration of one revolution of the shaft 19. Magnet C moves the holding or locking bar, 1.5 into the cutouts in the levers 8, 9, 10 etc., so as to lock the keys in operated position. These magnets (A, 211 and C) deenergize at the end of a revolution of shaft 19 thus releasing thelocking bar to release the keys. The pawl 212 of magnet 211 steps the perforated tape '71 by one step.

The shaft 19 is geared with the shaft 20 over belts 21S and 22o and a gear 219 so as to rotate shaft 2li (at the end of each revolution of shaft 19) by one or more steps.

The shaft 20 drives the auxiliary permutation disk 57 through the drive 22d-222 and the auxiliary permutation disk 57 is thereforelikewise advanced by one or more steps incident to the similar advance of (the coder) shaft 20.

The depression of one of the keys 5, 6, 7 etc., thus causes rotation of the shaft 19 (by one revolution). In addition thereto, the key operated contacts such as 12, 13, 14 etc., Will'be closed. This closes a circuit (assuming one key to have been actuated) which extends over lthe switch 216 (shown in the coding position) to the input side or disk 31 of the permutation disks 2li-25. This circuit is scrambled in these permutation disks and extends in each scrambled or coded form to a contact at the output side (disk 32) and from there to a contact on the disk 73 in the printer.

The wiper on the scanning disk 75 picks up the potential of this current and conducts it to the printervmagnet S3. This causes the printing of the scrambled, that is to say, of the coded signal.V

The true text is similarly printed on the tape 78 by the magnet 82 which is operated when the wiper on the' disk 74 nds a current carrying contact on the disk 72, such contact extending to a corresponding contact on the coder input disk 31.

Upon completion of such printing of the coded signal, for example, near the end of the revolution of the shaft 19, the shaft 20 will be advanced by one step. The wiper disks 26-29 will take along (frictionally) only those of the permutation disks 21-25 which are not held against rotation by their associated magnets 47-51.

The permutation disks 21--25 are in this manner always variably advanced or held against advance, thus causing an interchange of the circuit connections extending between the input and the output disks 31 and 32.

The holding magnets 47-51 (for controlling the armatures :l1-45 and therewith the setting of the permutation disks 21-25) may be controlled in three dierent ways, which may be applied alone or in combination, depending on the closed or open position of the switches 223-225.

The permutation disks 21-25 form links in the circuit from the input disk 31 to the output disk 32. Some of the contacts 52-56 associated with the permutation disks will be closed by the associated cams 226. In Fig. 1, it is assumed that contacts 52, 54 and 55 are closed while contacts 53 and 56 are open. The leads connected with these contacts extend over the switch 225 (assumed to be closed) to contacts on the input disk 227 of the auxiliary permutation disk 57. In this disk (57) the circuits are in known manner interchanged again and the corresponding (additionally interchanged or coded) signal currents are conducted to the output disk 22d or" the disk 57 and from there to the holding magnets E7-S1.

For example, if contact 52 is closed, the permutation disk 21 will be held by the operation of magnet 47. In another position, the auxiliary permutation disk 57 will cause energization of another magnet (for example, 48 or 49 etc.) by current from the contact 52.

The selection rods are in known manner set by the actuation of the keys such as 5, 6, 7 and close contacts such as 66-70. From these contacts extend five leads over the switches217 and 224 to the input disk 227 of the auxiliary permutation disk 57. The corresponding signal circuits are similarly interchanged (coded) in the disk 57 and similarly conducted to the magnets 437-51.

Contacts 206-210 are provided which are actuated by the levers 201-205 governed by the perforated tape '71. These contacts (20o-216) are wired to the switch 223 and ifthis switch is closed, the potentials of the corresponding circuits will reach the input disk 227 of the auxiliary permutation disk 57 which performs additional interchange of the circuits for corresponding control of the magnets 47-51.

Assuming that none of the contacts 52-56, en -70, Miti-210 which may be in a circuit to the holding magnet 51, is closed, the permutation disk 25 will not be held against rotation; but if a single one of these contacts should be operated, the disk 2S will be held by the actuation of its magnet 51.

The three contact groups (S2-S6/ 66-70/26-21l3) are therefore adapted to act individually and also collectively upon the control of the holding magnets 457-51 and therewith effect control of the permutation disks 22-25- Eachgroup of contacts may be selectively switched in by the switches 223, 224, 225, respectively.

The positioning of the armatures l1-1l5 and therewith the holding of the disks 21-25 is elfected during the rotation of the shaft 20, that is, after coding of a symbol. It will be clear therefore that each cam position of the disks 21-25 or each symbol marked by the actuation of the keys 5, 6, 7 etc., or each combination on the tape 71 always aifects the coding of the next successive symbol.

The coding of a true-text symbol thus affects the coding of the next successive symbol and it follows, therefore,

that the last true-text symbol. must affect. the next' successive symbol in the decoding operation. The magnets 47-51 therefore` cannot be controlled, in the decoding, from the contacts 66-70 which do not in such' a case represent true-text signals or symbols, since the coded signals are put into the keys in the decoding operation. The decoded signal appears in the decoding at the type wheel 76.

Associated with this type wheel 76 are the cam disks 101-105 having cams corresponding to the signals in the S-letter combination. The contacts ldd-131@ pick up the S-letter combination, during the rotation of the shaft 19, which corresponds to the true-text signal.

A magnet B is for this purpose associated withl the printer magnet 82 which actuates ve contacts such as contact b1 at times when the signal is printed by magnet 82. The respective leads from the five contacts b1 extend over contacts such as ai, which are at that time closed, to the switches 227 and 22d and thence to the auxiliary permutation disk 57, and from there, in previously described manner, to the holding magnets Ll-7-5 which control the setting of the permutation disks 21-25. Contacts such as r1 may be provided in the respective circuits for the magnets 47--51 for holding these magnets energized until the stepping of shaft 20 is carried out.

Relay A deenergizes upon completion of the revolution of shaft 19 and opens its contacts a1 thereby releasing the magnets 47-51.

The machine, so far as described, is adapted for the coding of texts which are manually keyed by operating the key mechanism. If the machine is to be used for coding in coaction with a teleprinter, the key mechanism may be substituted by a suitable printer operating, for example, with the five-letter code, for directly actuating the contacts such as shown at ft2-14. The advance of the permutation disks 21-25 may then be controlled directly by the selection rods of the teleprinter. The coded text at the receiver may in similar manner be fed to the permutation mechanism.

If the coding machine is to be used for perforating a tive-letter tape instead of for printing the coded text, there will be provided five contact disks in place of the type wheel '77 forming cams corresponding to the fiveletter code, and these cams coact with suitable control contacts which carry out the perforation of an associated tape by means of associated punch magnets. The arrangement, details of which are shown in Fig. 4, is in such a case mechanically similar to the arrangement of the cams ll- 105 and associated contacts lfm-110, except that the latter contacts actuate punch magnets.

Referring to Fig. 4, sets of ve cam disks '76 and 77 take the place of the type wheels 76, 77. These cam disks carry the 5-lctter combination in form of cams and associated tlierc'ith are five punch magnets 301-305 and 306-310, respectively'. These punch magnets punch the S-hole combination into the two paper tapes 78 and 79. The magnets 82 and S3', which control the contacts 31.1 and 312, correspond to the magnets 82 and 33 in Fig. 2. The energization of these magnets (82' and 83') picks from the succession of the 5-letter combination of the cam disks 76', 77 certain letters, or rather to say, a certain S-letter combination which is thus punched in the tapes 78 and 79'.

Changes may be made within the scope and spirit of the appended claims.

I claim:

l. A coding machine wherein electrical circuits are assigned to individual symbols comprising a plurality of permutation disks for interchanging said circuits, rotatable wiper means disposed between adjacent permutation disks, a rotatable shaft carrying said wiper means, means for rotating said shaft and therewith said wiper means by predetermined increments of angular rotation to carry along said permutation disks by frictional engagement therewith, holding magnets, and means for selectively energizing said magnetsk to hold associated. permutation disks against frictional rotation by said wiper means.

2. The coding machine as defined in claim l,v together with cam means carried by' said permutation disks pe'- ripherally thereof, and contact means operable by said' cam means for controlling predetermined holding magnets.

3. "l" he coding machine as defined in claim 2, together with auxiliary permutation means for interchanging the circuits controlled by said contact means.

Ll. A coding machine according to claim l, comprising selection rods, keys. for controlling said selection rods, and contacts governed by said selection rods for governing the circuits of said holding magnets.

5. The coding machine as defined in claim 4, together with permutation means for controlling the association of said contacts with said holding magnets.

6. The coding machine as defined in claim 4, together with a five-letter perforated tape, and scanning means for said tape for governing the actuation of said holding magnets.

7. The coding machine as defined in claim 4, together with a five-letter perforated tape, and scanning means for said tape for governing the actuation of said holding magnets, eachperforation row of said tape governing the actuation of a predetermined holding magnet.

8. A coding machine according to claim l, comprising selection rods, keys for controlling said selection rods, rst contacts governed by said selection rods, cam means carried by said permutation disks, second contacts operable by said cam means, a five-letter perforated tape and scanning means operated by said tape, said first and said second contacts and said scanning means governing the actuation of said holding magnets, and auxiliary permutation means for interchanging the conductors associated with said first and said second contacts and with said scanning means.

9. The coding machine as defined in claim 8, wherein the number of perforations in said tape determines the number of steps to be executed by a permutation disk.

l0. The coding machine as defined in claim 1, comprising manually operable keys individual to said holding magnets for setting the individual associated magnets to hold respectively associated permutation disks in predetermined angular position.

1l. The coding machine as defined in claim 10, wherein the setting of the individual permutation disks by said manually operable keys is carried out during the rotation thereof, any of said disks being rotated until stopped by the actuation of its holding magnet responsive to Operation of the manually operable key associated therewith.

l2. The coding machine as defined in claim l, cornprising printing means for recording the true text and the coded text, respectively.

i3. The coding machine as defined in claim l, comprising printing means for recording the true text and the coded text, respectively, said printing means comprising rotatable type wheels, a printing magnet foreach type wheel, and means for scanning the current input and output paths of said permutation disks, said printing means being energized responsive to discovery of a current-carrying circuit by said scanning means.

14. The coding machine as defined in claim l, cornprising printing means for recording the true text and the coded text, respectively, said printing means comprising a rotatable type wheel for said true text and an exchangeable rotatable type wheel for said coded text.

15. The coding machine according to claim 1, comprising printing means for recording the true text and the coded text, respectively, and switching means for adapting the machine for decoding.

16. A coding machine as defined in claim l, Comprising printing means for recording the true text and the coded text, respectively, said printing means comprising a rotatable type wheel for said true text and an exchange- 9 able rotatable type wheel for said coded text, keys for determining the text to be coded, and switching means for adapting said machine for decoding, the lines to the keys of said machine being for the decoding operation connected with the lines for the recording of the coded 5 text in the sequence corresponding to the sequence of the types on the type Wheel for recording the true text.

17. The coding machine as defined in claim 1, comprising means for perforating on a tape the code combination corresponding to the coded text.

18. The Coding machine as deined in claim 17, wherein said last-named means comprises punching magnets, and ve cam Wheels for respectively actuating said punching magnets,

10 19. A coding machine according to claim 1, comprising contacts for determining the text to be coded, and means controlled by teleprinter signals for directly actuating said contacts.

References Cited in the le of this patent UNITED STATES PATENTS 1,502,376 Damm July 22, 1924 1,683,072 Hebern Sept. 4, 1928 2,028,772 Friedman et al Ian. 28, 1936 2,139,676 Friedman Dec. 13, 1938 2,402,182 Rosen June 18, 1946 2,527,661 Stack Oct. 31, 1950 2,547,515 Zenner Apr. 3, 1951 

